Sealing arrangement for liquid dispensing nozzle having vapor recovery

ABSTRACT

A liquid dispensing nozzle has sealing means, which seals the vapor recovery passage when the spout of the nozzle is not disposed in a fill pipe of a vehicle tank to be filled and seals the fill pipe so that the vapors escape from the tank to the vapor recovery passage of the nozzle when the spout is disposed in the tank to be filled. The sealing means includes a member, which is slidably mounted on the spout, having its sealing surface formed as a sector of a sphere so that the sealing means is effective for fill pipes of various angles.

[4 Feb. 18, 1975 United States Patent 1191 Lasater SEALING ARRANGEMENTFOR LIQUID DISPENSING NOZZLE HAVING VAPOR I Primary Examiner-Houston S.Bell, Jr. RECOVERY Attorney, Agent, or Firm-John G. Schenk Donald A.Lasater, Fairfield, Ohio Dover Corporation, New York, NY.

Jan. 15, 1973 [75] Inventor:

[73] Assignee:

[22] Filed:

A liquid dispensing nozzle has sealing means, which App! 323,799 sealsthe vapor recovery passage when the spout of the nozzle is not disposedin a fill pipe ofa vehicle tank to be filled and seals the fill pipe sothat the vapors es- 277/30 cape from the tank to the vapor recoverypassage of 13 7 3 34, 13 5 31 0 the nozzle when the spout is disposed inthe tank to be filled. The sealing means includes a member, which isslidably mounted on the spout, having its sealing surface formed as asector of a sphere so that the sealing means is effective for fill pipesof various angles.

[51] Int. [58] Field of Search............................ 141/198-229,141/59, 97, 287, 392, 46; 277/30; 285/226; 403/50, 51

10 Claims, 6 Drawing Figures PATENIEB FEB I 8 I975 SHEET 2 BF 3 SEALINGARRANGEMENT FOR LIQUID DISPENSING NOZZLE HAVING VAPOR RECOVERY Whenfilling a vehicle tank with gasoline through a dispensing nozzle, vaporsfrom the gasoline within the tank escape therefrom through the openingof the fill pipe in which the spout of the nozzle is inserted. Thisescape of the vapors into the atmosphere pollutes the air.

It has previously been suggested to provide a gasoline dispensing nozzlewith a vapor recovery passage and a sealing arrangement between the fillpipe of the tank being filled and the vapor recovery passage of thenozzle. Because of the large number of different types of automotivevehicles and the various angles of the fill pipes due to the location ofthe fill pipe in each of the vehicles, the previously suggested sealingarrangements have not always been effective for many types of fill pipe.

The present invention is an improvement of the previously suggestedsealing arrangement in that it enables a seal to be maintained betweenthe fill pipe and the vapor recovery passage for most fill pipesirrespective of their angles. The present invention accomplishes this byutilizing a member having a surface, which is formed of a sector of asphere, cooperating with a rotatable and slidable member on the spoutengaging with the fill pipe so that movement of the member, whichcooperates with the fill pipe and is rotatably and slidably mounted onthe spout, to various angles because of the angle of the fill pipe doesnot prevent sealing with the member which has the surface formed of thesector of the sphere.

An object of this invention is to provide an improved sealingarrangement for a liquid dispensing nozzle having a vapor recoverysystem.

Other objects, uses, and advantages of this invention are apparent upona reading of this description, which proceeds with reference to thedrawings forming part thereof and wherein:

FIG. 1 is a sectional view, partly in elevation, of a portion of anozzle having one form of the sealing arrangement of the presentinvention.

FIG. 2 is a fragmentary sectional view, partly in elevation, of thesealing arrangement of FIG. 1 with the spout of the nozzle disposed inthe fill pipe of a vehicle tank to be filled.

FIG. 3 is a fragmentary sectional view, partly in elevation, of anotherembodiment of the sealing arrangement of the present invention used withthe nozzle of FIG. l and showing the spout of the nozzle disposed in thefill pipe.

FIG. 4 is an enlarged fragmentary sectional view of a portion of thesealing arrangement of FIG. 3.

FIG. 5 is a fragmentary sectional view, partly in elevation, of anothermodification of the sealing arrangement of the present inventionutilized with the nozzle of FIG. 1 and showing the relation when thespout of the nozzle is not disposed in the fill pipe.

FIG. 6 is a sectional view, partly in elevation, of still anotherembodiment of the sealing arrangement of the present invention utilizedwith a different type of nozzle and showing the relation when the spoutof the nozzle is not disposed in the fill pipe.

Referring to the drawings and particularly FIG. 1, there is shown aliquid dispensing nozzle of the type more particularly shown anddescribed in the copending patent application of Donald A. Lasater andChester W. Wood for Liquid Dispensing Nozzle of The Automatic Shut-OffType, Ser. No. 318,237 filed Dec. 26, 1972, and assigned to the sameassignee as the assignee of this invention. The liquid dispensing nozzleincludes a nozzle body 10 having an inlet 11 to which a hose isconnected to supply a liquid such as gasoline, for example, to theinterior of the body 10. The body 10 has an outlet 12 with which a spoutl4 communicates to receive liquid from the interior of the body 10.

As specifically described in the aforesaid Liquid Dispensing Nozzle ofthe Automatic Shut-Off Type," application, the body 10 has a first ormain poppet valve 15, which is controlled by a manually operated leveror handle 16, and a second poppet valve 17 within the body 10. Thevalves 15 and 17 control the flow to the spout 14.

A spout adapter 18 is fixed to the body 10 by a screw 19. The outlet 12of the body 10 has one end of a bellows 20, which is preferably formedof gasoline resistant synthetic rubber, secured thereto by being heldthereon by an adhesive and a clamp 21.

The other end of the bellows 20 has a member 22, which is preferablyformed of a gasoline resistant elastomer such as synthetic rubber, forexample, connected thereto. The bellows 20 and the member 22 arepreferably formed by being molded as a single piece. The member 22 hasan enlarged opening 23 formed in the center thereof to enable the member22 to slide along the spout 14.

The member 22 has its surface 24 formed as a sector of a sphere so thata cylindrical extension 25 on a plate 26 engages the inner surface 24irrespective of the position of the plate 26 on the spout 14. The plate26, which is preferably formed of a suitable plastic such as Delrin, forexample, is secured to a disc 27, which is preferably formed of gasolineresistant synthetic rubber, so that the plate 26 and the disc 27 form asealing member.

The plate 26 has an opening 28,. which has its surface inclined,therein. The disc 27 has an opening 29 formed therein with the opening29 including a first portion 30, which is straight, and a second portion31, which is inclined. The inclined portion 31 of the opening 29 isaligned with the inclined surface of the opening 28 of the plate 26. Theopenings 28 and 29 enable the plate 26 and the disc 27 to be bothslidably and rotatably mounted on the spout 14.

A collar 32, which functions as a stop, is fixed to the spout 14 by asuitable means such as a set screw or welding, for example, and has thedisc 27 abutting an inclined surface 33 thereof to form a seal therewithwhen the spout 14 is not inserted within an opening 34 (see FIG. 2) of afill pipe 35 of a vehicle tank such as an automobile fuel tank, forexample. Accordingly, when the disc 27 engages the collar 32 and thecylindrical extension 25 of the plate 26 engages the surface 24 of themember 22 as shown in FIG. 1, the space therebetween is sealed from theatmosphere.

This sealed space communicates through the opening 23 in the member 22with an annular passage 36, which is formed between the bellows 20 andthe spout 14 and forms part of the vapor recovery arrangement of thebody 10. The annular passage 36 communicates with a vapor recovery tube37, which is supported on a guard 37' secured to the body 10, as moreparticularly shown and described in U.S. Pat. No. 3,653,415 to Boudot etal, through an annular passage 38, which is formed between the spoutadapter 18 and the body 10. The vapor recovery tube 37 is connected by asuitable hose to vapor recovery equipment.

Accordingly, when the spout 14 is not inserted in the opening 34 of thefill pipe 35, the vapor recovery equipment is not connected to theatmosphere but is sealed through the cylindrical extension 25 of theplate 26 sealingly engaging the surface 24 of the member 22 and the disc27 having a sealing contact with the collar 32.

When the spout 14 is inserted in the opening 34 in the till pipe 35 asshown in FIG. 2, a step 39 (see FIG. 1), which is formed in the collar32 by a notch, engages a lip 40 (see FIG. 2) of the fill pipe 35 toretain the spout 14 within the fill pipe 35. As the spout 14 is insertedinto the opening 34 in the fill pipe 35, end surface 41 of the disc 27abuts the end of the fill pipe 35 so as to not follow the movement ofthe spout 14 and the collar 32 into the fill pipe opening 34. Thisresults in the bellows 20, which continuously urges the member 22 towardthe free end of the spout 14 so as to always be in engagement with thecylindrical extension 25 of the plate 26, being slightly compressed.

Accordingly, when the spout 14 is in the position of FIG. 2, the vaporswithin the tank can flow through the opening 34 ofthe fill pipe 35, theopening 29 of the disc 27, and the opening 28 of the plate 26. Thevapors then pass through the opening 23 into the annular passage 36 fromwhich they flow through the annular passage 38 to the vapor recoverytube 37.

Thus, the movement of the spout 14 into the opening 34 of the fill pipe35 results in the seal between the disc 27 and the collar 32 beingbroken whereby the vapors can be recovered from the tank being filled.It is not necessary for the collar 32 to have the step 39 engaged by thelip 40 for the device to function since the operator could hold thespout 14 within the opening 34 of the till pipe 35. It is only necessarythat there be sufficient insertion of the spout 14 into the opening 34of the fill pipe 35 for the seal between the disc 27 and the collar 32to be broken. However, the locking of the spout 14 within the fill pipe35 by engagement of the step 39 of the collar 32 with the lip 40 of thefill pipe 35 insures that the seal between the collar 32 and the disc 27is broken and vapors can flow from the tank to the vapor recovery tube37.

To disconnect the spout 14 from the fill pipe 35, it is only necessaryto slightly move the spout 14 within the fill pipe 35 so that the step39 of the collar 32 is no longer engaged by the lip 40 of the fill pipe35. When withdrawal of the collar 32 from the fill pipe 35 is initiated,the collar 32 is engaged by the disc 27 due to the force of the bellows20 urging the member 22 toward the free end of the spout 14. As aresult, the seal again exists between the collar 32 and the disc 27whereby the vapor recovery system is not exposed to the atmosphere.Because of the surface 24 of the member 22 being formed as a sector of asphere, the cylindrical extension 25 always engages the surface 24irrespective of the amount of rotation of the disc 27 about the spout 14or the amount of tilting of the disc 27 relative to the spout 14. Thesemovements are due to the angle of the till pipe 35 in the particularvehicle.

Referring to FIG. 3, there is shown another form of the sealingarrangement of the present invention utilized with the nozzle bodyll] ofFIG. 1. The sealing arrangement includes a bellows 45, which may beformed of the same material as the bellows 20, for example. The bellows45 is secured to the outlet 12 of the body 10 by adhesive, for example.While the clamp 21 has not been shown, it should be understood that itcould be employed if desired.

The bellows 45 has one end connected to a member 46, which has the sameshape as the member 22. The member 46 is preferably formed of a plasticsuch as Delrin, for example. The bellows 45 is connected to the member46 in any suitable manner such as bonding, for example.

The spout 14 has the collar 32 thereon and cooperating with the disc 27.However, the plate 26 is replaced by a plate 47, which is preferablyformed of the same material as the plate 26 and has a cylindricalextension 48 thereon in the same manner as the cylindrical extension 25of the plate 26. However, the end of the cylindrical extension 48 has acircumferential groove 29 (see FIG. 4) to receive a cup seal 50. The cupseal 50, which is preferably formed of gasoline resistant syntheticrubber, bears against surface 51, which is formed of a sector of asphere in the same manner as the surface 24 of the member 22, of themember 46.

The cup seal 50 is designed so that any pressure within the vaporrecovery passage urges the cup seal 50 into engagement with the surface51 of the member 46. Furthermore, the seal 50 has a relatively lowfriction on the surface 51 but is sufficiently flexible to allow thecylindrical extension 48 to engage the surface 51 at all times.

The formation of the bellows 45 with a larger diameter than thecylindrical extension 48 results in the vapor pressure creating a moreeffective sealing arrangement. That is, a larger area is subjected topressure on a surface 52 of the member 46 than on the surface 51 so thatthe pressure differential across the member 46 urges the member 46 intoengagement with the flexible seal 50 on the cylindrical extension 48along with the urging produced by the bellows 45. Similarly, thediameter of the lip seal 50 is greater than the diameter of a lip 53 ofthe till pipe 35. As a result, there is less pressure acting on the disc27 than on the plate 47 so that this urges the disc 27 into sealingengagement with the lip 53 of the fill pipe 35.

The operation of this embodiment is the same as that described for thesealing arrangement of FIGS. 1 and 2. Thus, the vapor recoveryarrangement is sealed from the atmosphere.

Referring to FIG. 5, there is shown another form of sealing arrangementfor use with the nozzle body 10 of FIG. 1. A bellows 60, which is formedof the same material as the bellows 20, is secured to the outlet 12 ofthe body 10 by an adhesive, for example. The bellows has a portion 61,which is bonded to a surface 62 of a member 63, having its inner surface64 formed as a sector of a sphere. The member 63 is preferably formed ofa suitable plastic such as Delrin, for example. The

- bellows 60 also has a portion 65, which is bonded to end surface 66 ofthe member 63. Thus, the bonding of the portions 61 and 65 to the member63 connects the bellows 60 to the member 63.

The plate 26 and the disc 27 of FIG. 1 are replaced by a support member67, which is preferably formed of a suitable plastic such as Delrin, forexample, and a member 68, which is bonded to the support member 67. Themember 68 is preferably formed of gasoline resistant synthetic rubber.

The member 68 has an opening with a straight portion 69 engaging theinclined surface 33 of the collar 32 to form a seal therebetween whenthe spout 14 is not inserted in the fill pipe 35 in the same manner thatthe portion 30 of the opening 29 of the disc 27 engages the inclinedsurface 33 of the collar 32 to form a seal.

The member 68 has an end portion 70 engaging the surface 66, which isformed as a sector of a sphere, of the member 63 and is heldthereagainst by the bellows 60, which continuously urges the member 63toward the free end of the spout 14. The end portion 70 of the member 68functions in the same manner as the cup seal 50 of the modification ofFIGS. 3 and 4.

The support member 67 has a cylindrical extension 71 to support acylindrical portion 72 of the member 68. There also is contact betweenthe end of the cylindrical extension 711 of the support member 67 andthe surface 64 of the member 63.

The bellows 60 has a larger diameter than the end portion '70. The endportion 70 has a larger diameter than the lip 83 of the fill pipe 35 asshown in FIG. 3. Accordingly, the same utilization of the vapor pressureis obtained as in the embodiment of FIGS. 3 and 4.

The nozzle body 118 has a guard 73, which is preferably formed of metalmounted on the outlet 12 and retained thereon by a clamp 74, which issimilar to the clamp 21 of FIG. 1. The guard 73, which also is bonded tothe end of the bellows 60, protects the bellows 60 and limits the amountof compression of the bellows 60.

Referring to FIG. 6, there is shown another modification of the sealingarrangement for use with a liquid dispensing nozzle of the moreparticularly shown and described in the copending patent application ofCharles A. Holder for Liquid Dispensing Nozzle, Ser. No. 68,154, filedAug. 31, 1970 and assigned to the same assignee as the assignee of thisinvention. As more particularly shown and described in the aforesaidHolder application, the liquid dispensing nozzle includes a nozzle body88 having an inlet 81 to which a hose is connected to supply a liquidsuch as gasoline, for example, to the interior of the body 88. The body80 has an outlet 82 with which a spout 83 communicates to receive liquidfrom the interior of the body 10.

The spout 83 is connected to spout adapter 84, which is secured to theoutlet 82 of the body 88 by a screw 85. The spout 83 is retained in theend of the spout adapter 84 by threading and bonding.

The gasoline is supplied from the inlet 81 to the outlet 82 throughopening of a poppet valve 86 by a manually operated lever or handle 87.Opening of the valve 86 causes gasoline to flow into the spout 83.

The spout 83 has a vapor recovery tube 88 mounted therein. The vaporrecovery tube 88 communicates with a vapor recovery passage 89 in thenozzle body 80. The vapor recovery passage 89 communicates with vaporrecovery equipment in the manner more particularly described in theaforesaid Holder application. The vapor recovery tube 88 alsocommunicates with an annular chamber 98 for the reasons specificallydescribed in the aforesaid Holder application.

The lower end of the vapor recovery tube 88 communicates with an opening91 in the wall of the spout 83. The opening 91 is sealed from theatmosphere. The sealing of the opening 91 is accomplished by a member92, which is slidably mounted on the spout 83 and preferable formed ofgasoline resistant synthetic rubber, the plate 26, the disc 27, and thecollar 32.

Resilient means, such as a spring 93, is disposed between the member 92and a collar 94, which is fixed to the spout 83, to continuously urgethe member 92 toward the free end of the spout 83. The member 92 has itssurface 95 formed as a sector of a sphere for cooperation with thecylindrical extension 25 of the plate 26 in the same manner as thesurface 24 of the member 22 is formed.

The member 92 has an inwardly projecting annular portion 96 cooperatingwith the outer surface of the spout 83 to form a seal therebetween.Thus, the opening 91 is sealed from the atmosphere.

When the spout 83 is inserted in the opening 34 of the fill pipe 35, thedisc 27 ceases to engage the collar 32 whereby vapor can escape from thetank being filled through the opening 29 of the disc 27 and the opening28 in the plate 26 into the space formed between the member 92, theplate 26, and the disc 27. The vapor passes from the space through theopening 91 in the spout 83 into the vapor recovery tube 88.

If desired, the plate 26 and the disc 27 of FIG. 6 may be replaced bythe members 67 and 68 of FIG. 5. Additionally, the plate 26 of FIG. 6may be replaced by the plate 47 and the seal 50 of FIGS. 3 and 4 ifdesired.

An advantage of this invention is that it enables the spout of a liquiddispensing nozzle to be disposed within most any type of fill pipe of atank while still having a seal for the vapor recovery arrangement.Another advantage of this invention is that the sealing arrangement isreadily adapted for use with various types of liquid dispensing nozzles.

For purposes of exemplification, particular embodiments of the inventionhave been shown and described according to the best presentunderstanding thereof. However, it will be apparent that. changes andmodifications in the arrangement and construction of the parts thereofmay be resorted to without departing from the spirit and scope of theinvention.

What is claimed is:

1. A liquid dispensing nozzle having a body, a spout extending from saidbody and having its free end for disposition in an opening of a fillpipe of a vehicle tank or the like, and means to return vapor from thetank being filled; the improvement comprising means to form a sealbetween the fill pipe opening and said vapor return means when saidspout is disposed in the fill pipe; said sealing means including amember mounted for sliding movement along said spout; means continuouslyurging said member toward the free end of said spout; said member havinga sealing surface formed as a sector of a sphere; first means mountedfor sliding movement along said spout and rotating movement about saidspout; said first means being disposed between said member and the freeend of said spout; said first means being continuously positioned toengage said sealing surface of said member to form a seal therebetween;said spout having stop means disposed thereon between said first meansand the free end of said spout to engage said first means when saidspout is not disposed in the fill pipe to form a seal therebetween; saidvapor return means communicating with a sealed space formed between saidspout, said sealing surface of said member, said first means, and saidspout stop means; and said first means being removed from sealingengagement with said spout stop means while remaining in sealingengagement with said member when said spout is inserted in the fill pipeby compression of. said urging means, said first means forming a sealwith the fill pipe independently of said member orientation to causecommunication between said vapor return means and the tank being filled.

2. The improvement according to claim 1 in which said first meansincludes first and second members secured to each other, said firstmember of said first means engaging said sealing surface of said memberto form the seal between said first means and said member, and saidsecond member of said first means engaging said spout stop means to formthe seal between said first means and said spout stop means when saidspout is not disposed in the fill pipe.

3. The improvement according to claim 2 in which said first member ofsaid first means includes a cylindrical extension extending toward saidsealing surface of said member and said cylindrical extension has a sealsupported on its end to engage said sealing surface of said member toform the seal therebetween.

4. The improvement according to claim 3 including a bellows disposed insurrounding and spaced relation to said spout to form a portion of saidvapor return means between said spout and said bellows, said bellowshaving one end connected to said body and its other end connected tosaid member, and said bellows comprising said urging means.

5. The improvement according to claim 2 including a bellows disposed insurrounding and spaced relation to said spout to form a portion of saidvapor return means between said spout and said bellows, said bellowshaving one end connected to said body and its other end connected tosaid member, and said bellows comprising said urging means.

6. The improvement according to claim 2 in which said vapor return meansis disposed within said spout and said spout means; said member has aportion in sealing relation with the outer surface of said spout;

and said urging means comprises resilient means mounted on said spout.

7. The improvement according to claim 1 in which said first meansincludes first and second members secured to each other, said firstmember of said first means having a first portion engaging said sealingsurface of said member to form the seal between said member and saidfirst means, and said first member having a second portion engaging saidspout means to form the seal between said first and spout means whensaid spout is not disposed in the fill pipe.

8. The improvement according to claim 7 including a bellows disposed insurrounding and spaced relation to said spout to form a portion of saidvapor return means between said spout and said bellows, said bellowshaving one end connected to said body and its other end connected tosaid member, and said urging means comprising said bellows.

9. The improvement according to claim 1 including a bellows disposed insurrounding and spaced relation to said spout to form a portion of saidvapor return means between said spout and said bellows, said bellowshaving one end connected to said body and its other end connected tosaid member, and said bellows comprising said urging means.

10. The improvement according to claim 1 in which said vapor returnmeans is disposed within said spout and has one end communicatingexterior of said spout mounted on said spout.

1. A liquid dispensing nozzle having a body, a spout extending from saidbody and having its free end for disposition in an opening of a fillpipe of a vehicle tank or the like, and means to return vapor from thetank being filled; the improvement comprising means to form a sealbetween the fill pipe opening and said vapor return means when saidspout is disposed in the fill pipe; said sealing means including amember mounted for sliding movement along said spout; means continuouslyurging said member toward the free end of said spout; said member havinga sealing surface formed as a sector of a sphere; first means mountedfor sliding movement along said spout and rotating movement about saidspout; said first means being disposed between said member and the freeend of said spout; said first means being continuously positioned toengage said sealing surface of said member to form a seal therebetween;said spout having stop means disposed thereon between said first meansand the free end of said spout to engage said first means when saidspout is not disposed in the fill pipe to form a seal therebetween; saidvapor return means communicating with a sealed space formed between saidspout, said sealing surface of said member, said first means, and saidspout stop means; and said first means being removed from sealingengagement with said spout stop means while remaining in sealingengagement with said member when said spout is inserted in the fill pipeby compression of said urging means, said first means forming a sealwith the fill pipe independently of said member orientation to causecommunication between said vapor return means and the tank being filled.2. The improvement according to claim 1 in which said first meansincludes first and second members secured to each other, said firstmember of said first means engaging said sealing surface of said memberto form the seal between said first means and said member, and saidsecond member of said first means engaging said spout stop means to formthe seal between said first means and said spout stop means when saidspout is not disposed in the fill pipe.
 3. The improvement according toclaim 2 in which said first member of said first means includes acylindrical extension extending toward said sealing surface of saidmember and said cylindrical extension has a seal supported on its end toengage said sealing surface of said member to form the sealtherebetween.
 4. The improvement according to claim 3 including abellows disposed in surrounding and spaced relation to said spout toform a portion of said vapor return means between said spout and saidbellows, said bellows having one end connected to said body and itsother end connected to said member, and said bellows comprising saidurging means.
 5. The improvement according to claim 2 including abellows disposed in surrounding and spaced relation to said spout toform a portion of said vapor return means between said spout and saidbellows, said bellows having one end connected to said body and itsother end connected to said member, and said bellows comprising saidurging means.
 6. The improvement according to claim 2 in which saidvapor return means is disposed within said spout and has one endcommunicating exterior of said spout with the space between said member,said first means, and said spout means; said member has a portion insealing relation with the outer surface of said spout; and said urgingmeans comprises resilient means mounted on said spout.
 7. Theimprovement according to claim 1 in which said first means includesfirst and second members secured to each other, said first member ofsaid first means having a first porTion engaging said sealing surface ofsaid member to form the seal between said member and said first means,and said first member having a second portion engaging said spout meansto form the seal between said first and spout means when said spout isnot disposed in the fill pipe.
 8. The improvement according to claim 7including a bellows disposed in surrounding and spaced relation to saidspout to form a portion of said vapor return means between said spoutand said bellows, said bellows having one end connected to said body andits other end connected to said member, and said urging means comprisingsaid bellows.
 9. The improvement according to claim 1 including abellows disposed in surrounding and spaced relation to said spout toform a portion of said vapor return means between said spout and saidbellows, said bellows having one end connected to said body and itsother end connected to said member, and said bellows comprising saidurging means.
 10. The improvement according to claim 1 in which saidvapor return means is disposed within said spout and has one endcommunicating exterior of said spout with the space between said member,said first means, and said spout means; said member has a portion insealing relation with the outer surface of said spout; and said urgingmeans comprises resilient means mounted on said spout.